The Hindi word for sun is
सूर्य

Translations for sun and their definitions

सूरज	©
1. n. (astronomy) Sun
चार जुलाई को सूरज और पृथ्वी की दूरी सबसे अधिक होगी। - On July 4th the distance between the Sun and the Earth will reach its maximum.
सूरज की रौशनी - the light of the sun